DP Chemistry (last assessment 2024)
Question 19N.3.hl.TZ0.20c
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.hl.TZ0.20c |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Suggest | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
19N.3.hl.TZ0.20c
A proton-exchange membrane (PEM) fuel cell uses pure hydrogen gas as the fuel and a proton exchange membrane as the electrolyte.
(c)
Suggest an advantage of the PEM fuel cell over the lead-acid battery for use in cars.
[1]
Markscheme
liquid in cell is less/not corrosive
OR
does not contain lead/toxic chemicals
OR
larger energy density/charge capacity/current per unit mass
OR
does not have to be charged prior to use / is always ready for use «as long as fuel is available» ✔
